Fixed capacitors for use in electronic equipment - Part 17: Sectional specification: Fixed metallized polypropylene film dielectric a.c. and pulse capacitors

applies to fixed capacitors with metallized electrodes and polypropylene dielectric for use in electronic equipment. Capacitors which have mixed foil and metallized electrodes are also within the scope of this standard. These capacitors may have 'self-healing' properties depending on conditions of use. Capacitors covered by this specification are mainly intended for use with alternating voltage and/or for pulse applications. The maximum reactive power applicable is 10 000 var and the maximum peak voltage is 3 000 V.

Festkondensatoren zur Verwendung in Geräten der Elektronik - Teil 17: Rahmenspezifikation: Festkondensatoren mit metallisierter Polypropylen-Folie als Dielektrikum für Wechselspannungs- und Impulsbetrieb

Condensateurs fixes utilisés dans les équipements électroniques - Partie 17: Spécification intermédiaire: Condensateurs fixes pour tension alternative et pour impulsions à diélectrique en film de polypropylène métallisé

La CEI 60384-17:2005 s'applique aux condensateurs fixes à électrodes métallisées et à diélectrique en polypropylène destinés aux équipements électroniques. Les condensateurs équipés à la fois d'électrodes métallisées et d'électrodes en feuille sont également couverts par la présente norme. Ces condensateurs peuvent avoir des propriétés "d'auto-régénération" en fonction des conditions d'utilisation. Les condensateurs couverts par la présente spécification sont principalement destinés à être utilisés dans des applications à impulsions et/ou à tension alternative. La puissance réactive maximale est 10 000 var et la tension de crête maximale est 3 000 V. Cette deuxième édition annule et remplace la première édition parue en 1987. Elle constitue une révision mineure des tableaux, valeurs et références.

Nespremenljivi kondenzatorji za uporabo v elektronski opremi – 17. del: Področna specifikacija: nespremenljivi kondenzatorji z dielektrikom iz metalizirane polipropilenske folije za izmenične napetosti in impulzni kondenzatorji (IEC 60384-17:2005)

General Information

Status
Published
Publication Date
08-Dec-2005
Technical Committee
Drafting Committee
Parallel Committee
Current Stage
6060 - Document made available
Due Date
09-Dec-2005
Completion Date
09-Dec-2005

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SIST EN 60384-17:2006SLOVENSKIfebruar 2006

STANDARDNespremenljivi kondenzatorji za uporabo v elektronski opremi – 17. del: Področna specifikacija: nespremenljivi kondenzatorji z dielektrikom iz metalizirane polipropilenske folije za izmenične napetosti in impulzni kondenzatorji (IEC 60384-17:2005)Fixed capacitors for use in electronic equipment – Part 17: Sectional specification: Fixed metallized polypropylene film dielectric a.c. and pulse capacitors (IEC 60384-17:2005)©

Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljenoReferenčna številkaSIST EN 60384-17:2006(en)ICS31.060.10

EUROPEAN STANDARD
EN 60384-17 NORME EUROPÉENNE EUROPÄISCHE NORM

December 2005 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60384-17:2005 E
ICS 31.060.30
English version

Fixed capacitors for use in electronic equipment Part 17: Sectional specification:

Fixed metallized polypropylene film dielectric a.c. and pulse capacitors (IEC 60384-17:2005)

Condensateurs fixes utilisés

dans les équipements électroniques Partie 17: Spécification intermédiaire: Condensateurs fixes pour tension alternative et pour impulsions à diélectrique en film de polypropylène métallisé (CEI 60384-17:2005)

Festkondensatoren zur Verwendung in Geräten der Elektronik Teil 17: Rahmenspezifikation: Festkondensatoren mit metallisierter Polypropylen-Folie als Dielektrikum für Wechselspannungs- und Impulsbetrieb (IEC 60384-17:2005)

This European Standard was approved by CENELEC on 2005-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EN 60384-17:2005 - 2 - Foreword The text of document 40/1597/FDIS, future edition 2 of IEC 60384-17, prepared by IEC TC 40, Capacitors and resistors for electronic equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60384-17 on 2005-11-01. The following dates were fixed: – latest date by which the EN has to be implemented

at national level by publication of an identical
national standard or by endorsement
(dop)
2006-08-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)

2008-11-01 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 60384-17:2005 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60065 NOTE Harmonized as EN 60065:2002 (modified).
IEC 60384-14 NOTE Harmonized as EN 60384-14:2005 (not modified). __________
- 3 - EN 60384-17:2005
Annex ZA
(normative)
Normative references to international publications

with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60063 1963 Preferred number series for resistors and capacitors - - A1 1967

- - A2 1977
- - IEC 60068-1 - 1) Environmental testing Part 1: General and guidance

EN 60068-1 1994 2) IEC 60384-1 (mod) - 1) Fixed capacitors for use in electronic equipment Part 1: Generic specification

EN 60384-1 + corr. October 2001 2) 2001 IEC 60384-17-1 - 1) Part 17-1: Blank detail specification - Fixed metallized polypropylene film dielectric a.c. and pulse capacitors - Assessment levels E and EZ

EN 60384-17-1 2005 2) IEC 60410 - 1) Sampling plans and procedures for inspection by attributes

- - ISO 3 - 1) Preferred numbers - Series of preferred numbers
- -
1) Undated reference. 2) Valid edition at date of issue.

INTERNATIONAL STANDARD IEC60384-17 QC 301300Second edition2005-11 Fixed capacitors for use in electronic equipment –Part 17: Sectional specification: Fixed metallized polypropylene film dielectric a.c. and pulse capacitors

 IEC 2005

Copyright - all rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission,

3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch

Web: www.iec.ch V For price, see current cataloguePRICE CODE

Commission Electrotechnique InternationaleInternational Electrotechnical Commission

– 2 – 60384-17  IEC:2005(E) CONTENTS

FOREWORD...........................................................................................................................4

1 General............................................................................................................................7 1.1 Scope......................................................................................................................7 1.2 Object.....................................................................................................................7 1.3 Normative references..............................................................................................7 1.4 Information to be given in a detail specification.......................................................8 1.5 Terms and definitions..............................................................................................9 1.6 Marking.................................................................................................................10 2 Preferred ratings and characteristics..............................................................................11 2.1 Preferred characteristics.......................................................................................11 2.2 Preferred values of ratings....................................................................................11 3 Quality assessment procedures......................................................................................12 3.1 Primary stage of manufacture................................................................................12 3.2 Structurally similar components.............................................................................12 3.3 Certified records of released lots...........................................................................13 3.4 Qualification approval............................................................................................13 3.5 Quality conformance inspection.............................................................................20 4 Test and measurement procedures.................................................................................22 4.1 Visual examination and check of dimensions.........................................................22 4.2 Electrical tests.......................................................................................................22 4.3 Robustness of terminations...................................................................................25 4.4 Resistance to soldering heat.................................................................................25 4.5 Solderability..........................................................................................................25 4.6 Rapid change of temperature................................................................................25 4.7 Vibration................................................................................................................25 4.8 Bump....................................................................................................................26 4.9 Shock....................................................................................................................26 4.10 Climatic sequence.................................................................................................27 4.11 Damp heat, steady state........................................................................................28 4.12 Endurance.............................................................................................................28 4.13 Charge and discharge...........................................................................................30 4.14 Component solvent resistance...............................................................................30 4.15 Solvent resistance of the marking..........................................................................30

Bibliography..........................................................................................................................31

Table 1 – Preferred values....................................................................................................10 Table 2 – Preferred combinations.........................................................................................12 Table 3 – Sampling plan together with numbers of permissible defectives for qualification approval tests for a.c. and pulse capacitors.................................................14 Table 4 – Test schedule for qualification approval.................................................................15 Table 5 – Lot-by-lot inspection..............................................................................................21

60384-17  IEC:2005(E) – 3 – Table 6 – Periodic inspection................................................................................................21 Table 7 – Tangent of loss angle............................................................................................23 Table 8 – Insulation resistance requirements........................................................................23 Table 9 – Correction factors..................................................................................................24 Table 10 – Characteristics at lower category temperature.....................................................24 Table 11 – Characteristics at upper category temperature....................................................24 Table 12 – Preferred severities.............................................................................................26

– 4 – 60384-17  IEC:2005(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________ FIXED CAPACITORS FOR USE IN ELECTRONIC EQUIPMENT –

Part 17: Sectional specification: Fixed metallized polypropylene film dielectric a.c. and pulse capacitors

FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60384-17 has been prepared by IEC technical committee 40: Capacitors and resistors for electronic equipment. This second edition cancels and replaces the first edition published in 1987 and constitutes minor revisions related to tables, figures and references. The text of this standard is based on the following documents: FDIS Report on voting 40/1597/FDIS 40/1630/RVD

Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

60384-17  IEC:2005(E) – 5 – IEC 60384 consists of the following parts, under the (new) general title Fixed capacitors for use in electronic equipment: Part 1:

Generic specification
Part 2:

Sectional specification: Fixed metallized polyethylene-terephthalate film dielectric d.c. capacitors Part 3:

Sectional specification: Fixed tantalum chip capacitors Part 4:

Sectional specification: Aluminium electrolytic capacitors with solid and non-solid electrolyte Part 5:

Sectional specification: Fixed mica dielectric d.c. capacitors with a rated voltage not exceeding 3000 V – Selection of methods of test and general requirements Part 6:

Sectional specification: Fixed metallized polycarbonate film dielectric d.c. capacitors Part 7:

Sectional specification: Fixed polystyrene film dielectric metal foil d.c. capacitors Part 8:

Sectional specification: Fixed capacitors of ceramic dielectric, Class 1 Part 9:

Sectional specification: Fixed capacitors of ceramic dielectric, Class 2 Part 11:

Sectional specification: Fixed polyethylene-terephthalate film dielectric metal foil d.c. capacitors Part 12:

Sectional specification: Fixed polycarbonate film dielectric metal foil d.c. capacitors Part 13:

Sectional specification: Fixed polypropylene film dielectric metal foil d.c. capacitors Part 14:

Sectional specification: Fixed capacitors for electromagnetic interference suppression and connection to the supply mains Part 15:

Sectional specification: Fixed tantalum capacitors with non-solid or solid electrolyte Part 16:

Sectional specification: Fixed metallized polypropylene film dielectric d.c. capacitors Part 17:

Sectional specification: Fixed metallized polypropylene film dielectric a.c. and pulse capacitors Part 18:

Sectional specification: Fixed aluminium electrolytic chip capacitors with solid and non-solid electrolyte Part 19:

Sectional specification: Fixed metallized polyethylene-terephthalate film dielectric chip d.c. capacitors Part 20:

Sectional specification: Fixed metallized polyphenylene sulfide film dielectric chip d.c. capacitors Part 21:

Sectional specification: Fixed surface mount multilayer capacitors of ceramic dielectric, Class 1 Part 22:

Sectional specification: Fixed surface mount multilayer capacitors of ceramic dielectric, Class 2 Part 23:

Sectional specification: Fixed surface mount metallized polyethylene naphthalate film dielectric d.c. capacitors Part 24:

Sectional specification – Surface mount fixed tantalum electrolytic capacitors with conductive polymer solid electrolyte (under consideration) Part 25:

Sectional specification – Surface mount fixed aluminium electrolytic capacitors with conductive polymer solid electrolyte (under consideration) All sectional specifications mentioned above do have one or more blank detail specifications being a supplementary document, containing requirements for style, layout and minimum content of detail specifications.

– 6 – 60384-17  IEC:2005(E) The QC 301300 number that appears on the front cover of this publication is the specification number in the IECQ Quality Assessment System for Electronic Components. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be

• reconfirmed; • withdrawn; • replaced by a revised edition, or • amended. A bilingual version of this publication may be issued at a later date.

60384-17  IEC:2005(E) – 7 – FIXED CAPACITORS FOR USE IN ELECTRONIC EQUIPMENT –
Part 17: Sectional specification: Fixed metallized
polypropylene film dielectric a.c. and pulse capacitors

1 General 1.1 Scope This part of IEC 60384 applies to fixed capacitors with metallized electrodes and poly-propylene dielectric for use in electronic equipment. NOTE

Capacitors which have mixed foil and metallized electrodes are also within the scope of this standard. These capacitors may have "self-healing" properties depending on conditions of use.

Capacitors covered by this specification are mainly intended for use with alternating voltage and/or for pulse applications. The maximum reactive power applicable is 10 000 var and the maximum peak voltage is 3 000 V. Capacitors for reactive power exceeding 500 var and to which a maximum peak voltage of 2 500 V at 50 Hz can be applied are not covered by this standard, except when they are the highest part of a range of reactive power mainly situated below 500 var at 50 Hz.

This standard is not intended to cover capacitance values higher than 20 µF. Two performance grades of capacitors are covered, Grade 1 for long-life application and Grade 2 for general application.

Capacitors for electromagnetic interference suppression are not included, but are covered by IEC 60384-14. Capacitors for electrical shock hazard protection (covered by IEC 60065) and fluorescent lamp and motor capacitors (covered by IEC technical committee 33, and IEC technical committee 34) are also excluded. 1.2 Object The object of this standard is to prescribe preferred ratings and characteristics and to select from IEC 60384-1, the appropriate quality assessment procedures, tests and measuring methods and to give general performance requirements for this type of capacitor. Test severities and requirements prescribed in detail specifications referring to this sectional specification shall be of an equal or higher performance level, because lower performance levels are not permitted. 1.3 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60063:1963, Preferred number series for resistors and capacitors

Amendment 1 (1967)
Amendment 2 (1977)

– 8 – 60384-17  IEC:2005(E) IEC 60068-1, Environmental testing – Part 1: General and guidance IEC 60384-1, Fixed capacitors for use in electronic equipment – Part 1: Generic specification IEC 60384-17-1, Fixed capacitors for use in electronic equipment – Part 17: Blank detail specification: Fixed metallized polypropylene film dielectric a.c. and pulse capacitors. Assessment level E IEC 60410, Sampling plans and procedures for inspection by attributes

ISO 3, Preferred numbers – Series of preferred numbers 1.4 Information to be given in a detail specification Detail specifications shall be derived from the relevant blank detail specification. Detail specifications shall not specify requirements inferior to those of the generic, sectional or blank detail specification. When more severe requirements are included, they shall be listed in 1.9 of the detail specification and indicated in the test schedules, for example by an asterisk. NOTE

The information given in 1.4.1 may for convenience, be presented in tabular form. The following information shall be given in each detail specification and the values quoted shall preferably be selected from those given in the appropriate clause of this sectional specification. 1.4.1 Outline drawing and dimensions There shall be an illustration of the capacitor as an aid to easy recognition and for comparison of the capacitor with others. Dimensions and their associated tolerances, which affect interchangeability and mounting, shall be given in the detail specification. All dimensions shall preferably be stated in millimetres. Normally, the numerical values shall be given for the length of the body, the width and height of the body and the wire spacing, or for cylindrical types, the body diameter, and the length and diameter of the terminations. When necessary, for example when a number of items (capacitance values/voltage ranges) are covered by a detail specification, the dimensions and their associated tolerances shall be placed in a table below the drawing. When the configuration is other than described above, the detail specification shall state such dimensional information as will adequately describe the capacitor. When the capacitor is not designed for use on printed boards, this shall be clearly stated in the detail specification 1.4.2 Mounting The detail specification shall specify the method of mounting to be applied for normal use and for the application of the vibration and the bump or shock tests. The capacitors shall be mounted by their normal means. The design of the capacitor may be such that special mounting fixtures are required in its use. In this case, the detail specification shall describe the mounting fixtures and they shall be used in the application of the vibration and bump or shock tests. 1.4.3 Ratings and characteristics The ratings and characteristics shall be in accordance with the relevant clauses of this specification, together with the following:

60384-17  IEC:2005(E) – 9 – 1.4.3.1 Rated capacitance range See 2.2.1. NOTE

When products approved to the detail specification have different ranges, the following statement should be added: "The range of values available in each voltage range is given in IEC QC 001005." 1.4.3.2 Sinusoidal current (if applicable) The detail specification shall state the derating curve of the sinusoidal current versus temperature with reference to 70 °C, and the derating curve of the sinusoidal current versus frequency and of the sinusoidal current versus capacitance. 1.4.3.3 Particular characteristics Additional characteristics may be listed, when they are considered necessary to specify adequately the component for design and application purposes. 1.4.3.4 Soldering The detail specification shall prescribe the test methods, severities and requirements applicable for the solderability and the resistance to soldering heat test. 1.4.4 Marking The detail specification shall specify the content of the marking on the capacitor and on the package. Deviations from 1.6 of this sectional specification, shall be specifically stated. 1.5 Terms and definitions For the purposes of this document the terms and definitions given in IEC 60384-1 and the following apply. 1.5.1 Performance grades 1.5.1.1 performance grade 1 capacitors (long-life) capacitors intended for long-life applications with stringent requirements for the electrical parameters 1.5.1.2 performance grade 2 capacitors (general purpose) capacitors for general application where the stringent requirements of performance grade 1 are not necessary

1.5.2 stability grade capacitance drift after climatic and mechanical tests and after endurance tests.

NOTE The performance grade and the stability grade must be noted in the detail specification 1.5.3 performance grade and stability grade combinations (if stability grade is required for a.c. and pulse capacitors) see the table below for preferred values:

– 10 – 60384-17  IEC:2005(E) Table 1 – Preferred values Performance grades Stability grades Combination designations 1 1.1

1 2 1.2 2 – 2 The three combinations concern capacitance stability and tan δ values. Distinction in performance of the three combinations is shown in Table 4. 1.5.4 rated voltages NOTE

The sum of the d.c. voltage and the peak a.c. voltage or the peak pulse voltage applied to the capacitor must not exceed the rated voltage. The value of the peak a.c. voltage allowed at different frequencies is under consideration. 1.5.4.1 rated d.c. voltage maximum d.c. voltage which may be applied continuously to a capacitor at the rated temperature 1.5.4.2 rated a.c. voltage maximum r.m.s. alternating voltage which may be applied continuously to a capacitor at the rated temperature and at a given frequency 1.5.4.3 rated pulse voltage peak value of the pulse voltage which may be applied continuously to a capacitor at the rated temperature and at a given frequency 1.5.5 rated voltage pulse slope R)(d)(dtU (if applicable) maximum admissible value of the voltage slope tUdd of a pulse, at the rated temperature at such a repetition frequency that no significant increase of temperature occurs 1.6 Marking See 2.4 of IEC 60384-1, with the following details: 1.6.1

The information given in the marking is normally selected from the following list; the relative importance of each item is indicated by its position in the list: a) rated capacitance; b) rated a.c. and/or pulse voltage (a.c. voltage may be indicated by the symbol ~) and the corresponding frequency if different from 50 Hz; c) tolerance on rated capacitance; d) rated voltage pulse slope (if applicable); e) rated current and corresponding frequency (if applicable); f) year and month (or week) of manufacture;

60384-17  IEC:2005(E) – 11 – g) manufacturer's name or trade mark; h) climatic category; i) manufacturer's type designation; j) reference to the detail specification. 1.6.2

The capacitor shall be clearly marked with a), b) and c) above and with as many as possible of the remaining items as is considered necessary. Any duplication of information in the marking on the capacitor should be avoided. 1.6.3

The package containing the capacitor(s) shall be clearly marked with all the information listed in 1.6.1. 1.6.4

Any addition marking shall be so applied that no confusion can arise. 2 Preferred ratings and characteristics 2.1 Preferred characteristics The values given in detail specifications shall preferably be selected from the following: 2.1.1 Preferred climatic categories The capacitors covered by this specification are classified into climatic categories according to the general rules given in IEC 60068-1. The lower and upper category temperatures and the duration of the damp heat, steady state test shall be chosen from the following: Lower category temperature:

–55 °C, –40 °C, –25 °C and –10 °C Upper category temperature:

+70 °C, +85 °C; +100 °C and +105 °C Duration of the damp heat, steady state test:

4, 10, 21 and 56 days The severities for the cold and dry heat tests are the lower and upper category temperatures respectively. 2.2 Preferred values of ratings 2.2.1 Rated capacitance (CR) Preferred values of rated capacitance are values chosen from the E series of preferred values given in IEC 60063. 2.2.2 Tolerances on rated capacitance The preferred tolerances on the rated capacitance are ±20 %; ±10 %; ±5 %; ±2 %; ±1 %. 2.2.3 Rated capacitance with associated tolerance values For preferred combinations of capacitance series and toler

...

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